- John Golden
A beautiful construction by Josef Kurschak, connected to his visual proof that the area of the this dodecagon is 3 times the circumradius. What questions does it raise? Read about the tile at MathWorld: http://mathworld.wolfram.com/KurschaksTile.html Read about Kurschak at Wikipedia: http://en.wikipedia.org/wiki/J%C3%B3zsef_K%C3%BCrsch%C3%A1k
More GeoGebra at mathhombre.blogspot.com.